Method of and apparatus for weaving



Oct. 14, 1930. G. H. PERKINS 1,778,336

METHOD OF AND APPARATUS FOR WEAV ING Filed Nov. 17, 1928 4 Sheets-Sheet1 r z W 2: lellA 76 3 WWW A 3 2 fl mw WWW .A 7 7 7 w rr z 5 J 2 M F J AM m 14, 11930. G. H. PERKINS 1,778,336

METHOD OF AND APPARATUS FOR WEAVING Filed NOV. 17, 1928 4 Sheets-Sheet.2

Oct. 14, 1930. G, PERKINS 1,778,336

METHOD OF AND APPARATUS FOR WEAVING Filed NOV. 17, '1928 4 Sheets-Sheet3 @y i *W WWW?- Get. 14, 1930- 5, kms 1,778,336

METHOD OF AND APPARATUS FOR WEAViNG Filed Nav. 17, 1928 4 Sheets-Sheet 4Patented :Qet. 14, 1930 S 'EZWEfi ATEN F lCE H. PEBKWIIIS, or SALEM,MASSACHUSETTS, ASSIGNOR TO THE nsrronn MILLS, on Esiv 'enn, nnopnrsnAnnACORPORATION OF 21-101m- ISLAND METHOD OF AND APPARATUS FOR WEAVINGApplication filed November 17, 1928. Serial No. 820,153.

. This invention pertains to textile manufacture and,relatesinoreparticularly to a method of. and apparatus for Weavingpatterned textile fabrics, the present method and apparatus bein'ginthenature oita'n improvement upon the method; and apparatus disclosed inthe application 0i George H.

Perkins, Serial No. 298,901, filed August 11, 1928 As more fullydescribed in said application, the usual method of Weaving, particularlywhen applied to the production of long pattern repeats, results in very,substantial Waste of the ivo'ven material incidentto the removal. ofsuccessive 'cutsfi'omthe loom and in preparation for certain finishingprocesses. In accordance with the disclosure of the aforesaidapplication provision is made for Weavinga length Waste fabric formingless than a full repeat of the pattern at that point' thew'eavingoperation at which the, material is to be cut for removal from theloonnthereby producinga short flap at the end of the last full repeat ofa cut'and a correspondingshort fiap'in advance of the firstpattern'repeat oi". the nest cut. This'is accor lished in the aforesaiddisclosure by Weavmg' the pattern bach- Wardlyfor a distancesubstantially edual'to i al'f the length of the desired'piece ef'ivastefabri at the end ofthe last full repeat of the pattern, and then.Weaving; thepattern forwardly again'to the startin'g; point of a newfull repeat to complete the piece of Waste fabric, the aste fabric thus\VOYGTX bacliwardly and forwardly between full repeats providing thenecessary material the desired flap at the ends of the cuts butusnallybeing in 'lengththan a full peat or". the pattern! n Foraccomplishing this result the afore said application discloses' theapplication oi the invention to a jacquard pattern mechanism, andprovides apparahisfor causing tlie' jacquard cards, when desired,reverse their normal direction of movement until approximatelyone-haliiot the desired intermediate Waste material has been ov and thenagain to reverse and move for iv'ai dly in thenor nialdirection for thesame pattern elements, sometimes sei eral hen ed in number, WlllCll mustbe moved back. ardly in opposition to their usual. direction of travelWhile Weaving the first half of the Waste or flap forming section offabric.

In accordance with the present invention I accomplish the desiredresult, that to say the provision of the short intermediate portion ofWaste material by weaving the pattern (following the last full. repeatofthe pattern) a very short section, for example four picks in thereverse direction, following this with a like very short section in theforward or normal directionfthen a ain iii the reverse direction, and onalto ailv until the desired length of material has been produced, thelast of said short sections being in the forward direction so that atits completion all. is in readiness to proceed in orderly manner withthe next full repeat of the pattern. v i I lVhen using a drop box orother'form of shuttle or color changing loom, the reversal of thepattern means, "for Xample the series out jacquard cards, will usuallyresult'in the production of fabric in which the normal A attern isindistinct, confused, or even Wholly absent. but since the err-fer ofwarp shedding as determined by the reversely moving" pa tern elen'icntsinverse to the normal order, I have for convenieiure in descri en andillustration referred to the resultant fabric of reverse pattern, whichwould be substantially true in the simpler forms of Weavin and I Wish itto be'uuderstood that Wherever I havereferred 'to reversal. of thepattern I have particular reference to the order of warp sheddinfg,rather than to the specific appearanceof the completed fabric. i Thepreferred mechanism for accomplishing the above result" comprises means'for of the pattern elements to insure of illustrating the invention,and that moving a relatively small number of pattern elements such asjacquard cards, first in one direction and then in the other inalternation so long as is necessary for weaving the predeterminedportion of waste material, whereupon the pattern elements resume theirnormal forward movement for production of full pattern repeats. Sincethe pattern characteristics of the waste section are of no importance,it is necessary, during the alternate forward and reverse operation ofthe pattern devices, merely to employ a sufficient number the productionof coherent fabric, and for this-purpose four pattern elements areusually suffic nt, although it is within the scope of the invention toemploy a larger or smaller number if permissible or desirable.

In the a-ccom Jan iiw'draivin 's certain de sirable steps comprised inmy novel me hod of weaving are disclosed by way o'f'ez: iple togetherwith apparatus useful in perforn v ing said steps, it being understo'dthat the accompanying drawings are merely by way they arenot to beunderstood as limiting the inventionto the specific arrangement ofparts, or tothe specific order of steps except as defined by theappended claims.

showing certain partsof a jacquard mec 1anism of usual type-having thepresent improvements applied thereto;

v-Fig. 5 is a fragmentary end elevation to larger scale looking from theleft-hand side formed at eachend. of the cut is much too of Fig. 4i;

Fig. (Sis a section to larger scale, sub 'lazu tially on the line 66 ofFIQQ 5;

Fig. 7 1s a fragmentary v-ci Fig. 8 is a similar section on of Fig. 6;and

Fig.9 is a fragmentary vertical smaller scale ontheline 9- 9 of 6.

In accordance with. the usual processes of weaving pattern fabrics it iscustomary, when sufficient material to form a out has been provided,'toweave a section forming a complete repeat of the pattern which is thencut substantially midway its length to permit removal of the first cutof materialfromthe The wastepiece-of material thus long to serve as anattaching flap in prepar- -l section ing the material for the finishingoperation so that a substantial portion of it must cut away.

In accordance with the present invention, as illustrated in Figs. 1 and2, I produce a series of repeats A, A in usual manner,but at the end asof the last repeat of this series, instead of proceeding normally toweave a waste repeat, I reverse the pattern mechanism and cause the loomto weave the pattern backwardly for a predetermined short distance,

forming a small section A. In accordance with the present invention thisreverse weavingis of very-shortduration, for example four picks,whereupon I resume forward weaving, that is to say, normal forwardmovement of the pattern while weaving another short section A whichlikewise comprises but a few picks, for example four.

I thus continue weaving a fewpicks back- .wardly and then a similarnumber of picks forwardly until I have produced a length of fabricsufficient to produce a single attaching fiap. At this point in theweaving, without interrupting the operation of the pattern mechanism, Imay weave in one or more picks of a contrasting color to produce a'cutmarker G. I then continue in the same manner to weave with alternatereversals another series A or A of short sections until I have producedanother section of fabric sufficient to form a single attaching flap.The last short section A of this flap orwaste-portion of material iswoven in the normal forward direction of the pattern so that when thepoint 3 is reached, which marks the beginning of a new series B ofpattern repeats, the pattern mechanism stands in exactly the samepositionthat it did at the point 00 at which the abnormal patternmovement commenced; The loom maynow continue to function in normalmanner, producing a second series of repeats B, and the first cut offabllC comprising the series A maybe removed from the loom by cuttingalong the line C.

In the diagrammatic illustrations of Figs. 1 and 3 Ihave indicated but asmall number of reversals in the pieceof wastematerial and the relativewidth of'the alternating sect-ions making up this piece of wastematerial-is very greatly exaggerated, indicating many more than fourpicks, but this mode of illus- .ration has been adopted to facilitatethe descriptionand in view of the fact that'upou the scale selecteditwould'be substantially impossible to show sections of four picksextent. v p

In accordance with the above method the attaching flapsat the end of onecut and at the beginning of the next may be madeas sl'rort as desired,since the length of such flaps is in no way dependent upon the length ofthe normal pattern repeat.

W'hilel contemplate that the above method may be carried outin'various'ways and by the use offvarious fo "ms of mechanism, and whileit is broadly independent of the particular type of pattern mechanismwhich may be employed, I have here chosen to illustrate mechanism forpracticing this process upon a loom provided with jacquard mechanismsuch as is used in the weaving of blankets and similar materials.

One common form of jacquard mechanism employs two series of jacquardcards which I are moved alternatel step by step, and while .11. seriespassing around the usual drums and the presentinvention is of broaderutility, I have chosen herein to illustrate one embodiment of themechanism particularly adapted for e in connection with a jacquardemploying two series of cards, although it is equally applicable, by themere omission of parts, to a jacquard mechanism employing but one seriesof cards.

Referring more particularly to Figs. 4 and 5'. I have illustratedcertain parts of the jacquard proper in order to indicate theapplication of thepresent mechanism thereto. Thus in Fig. 4 the twoseries of jacquard ca are indicated respectively at 3 and 4, 1

6. These drums mounted to turn in ournal bearings carried by bars 7 and8 sliding in suitable guides in the frame and having slotted'brackets 9and 10 respectively which engage drive rollers 11 and 12 carried byvertically sliding rods 13 and 14 respectively.

he rods 13 and 14 are reciprocated vertically by means of levers l5 and1(5 actuated by cams or other devices usual in the art but not shown.This vertical movement of the rods '13 and 14 is transmitted through thecam series 3 of cards in a normal or forward dircction. In the same waya forward driving pawl 19*, pivoted at 21, normally cooperates with thepins 18 of drum 6 to advance the series 4 of cards in the normal orforward direction.

The novel mechanism forming the subject matter of the present inventioncomprises a base or frame 22 (Figs. 4 and 5) which may conveniently bemounted upon a beam 23 constituting one of the. usual supports for thejacquard mechanism. This base or frame provided with upstanding brackets24 and 25 provided with bearings for parallel shafts 26 and 27. Theshaft 26 is provided, near its opposite ends, with rearwardly extendingarms 28 and 29 respectively. These arms are slotted at their rear endsfor the reception of pins at the lower ends of brackets 30 and 31respectively which are attached to the lower ends of pawl lifter rods 32and 33 guided to slide Vertically in bearing brackets 32, 33 projectingforwardly from the frame of the jacquard mechanism. The rods 32 and 33carry pawl lifters 34 and 35 respectively which underlie portions of thepawls 19 and 19. In the normal position, during regular weaving, therods 32 and 33 with the pawl lifters 34 and 35, are in the positionindicated in Fig. 5, where they do not interfere with the normalengagement of the pawls 19 and 19 with the pins of the jacquard drums.

In accordance with the present invention I provide reverse driving pawls36 and 37, pivoted at 38 and 39 respectively, which are adapted undercertain conditions to engage the pins of the drums 5 and 6 respectivelyand to turn the drums in reverseor backward direction. The pawls 36 and37 are urged upwardly toward operative position by means of springs 40(Fig. 5) (but one of which is shown) but are normally held down out ofoperative engagement with the jacquard drums by means of pawl depressingarms 43 projecting rearwardly from collars 42 mounted on the rods 32 and33 respectively.

Referring more particularly to Figs. 4, 5 and 7, the shaft 27 has ii Xedthereon a ratchet wheel 44, here shown as having eight teeth. A pawl 45is adapted at times to engage this wheel for turning it, thereby turningthe shaft 27. The pawl 45 is mounted upon an arm 46 of a bell cranklever free to turn on the shaft 27 and having a second arm 47 providedwith an elongate slot 48 which receives a pin 49 projecting from abracket 50 secured to the rod 14. Thus the rod 14 reciprocates the arm46. hen the pawl 45 en gages the ratchet 44 the ratchet and shaft 27 areturned step by step.

The pawl 45 is provided with a lateral pin 51 which, during normalweaving, rests upon an elevated surface of a controlling cam 53 mountedto turn freely on the shaft 27, thus holding the pawl out of engagementwith its ratchet wheel. The cam 53 is provided with an actuating armprojecting rearwardly and having a pull rod 56 pivotally attached to itsforward end. This pull rod passes down through an opening in the support22 and is provided with a handle 57 at its lower end within convenientreach of an operator stationed at the frontof the loom. A spring 58tends to lift the rod 56 and thus to hold the arm in the dottedposition, shown at (Fig. 8) with the high part 52 of the cam. 53 beneaththe pin 51 and the pawl 45 out of engagement with the teeth of ratchetwheel 44.

The cam 53 is provided with a single retaining tooth 6O normallyoccupying the position 60 in Fig.8. Then the cam has been'turned to thefull line position indicated in Fig. 8,

this tooth snaps behind a retaining latch 61 carried by a shaft 62journaled in a bearing sleeve 63 (Figs. 4 and 6) the pawl normallybeingheld in operative or engaging position by means of a weight 64 oran equivalent spring. The shaft 62 is provided with a releasing armwhich isadapted at tiniest-c be engaged by a pin 66 projecting from theface of a ratchet wheel 67 mounted toturn freely on the shaft 27. Thisratchet wheel 67 is turned step by step'by means of a pawl 68 mountedona lever 69 secured to the shaft 26, the pawl being held in engagementwith the ratchet wheel by means of a spring 7 O. Preferably a lockingpawl 71, provided with a counterweight 7 2, is mounted toturn freely onthe shaft 26 and engages the ratchet wheel 67 to prevent reversemovement of the latter.

A cam 7 3 (Fi s. 6 and 9) is fixedly secured to the shaft 27. This camcom JflSGS a hi h I n l portion 4 and a low portion 45, each being ofsubstantially a semi-circumference: in 6211 tent. A roller 76, carriedby anarm 7 7, engages the peripheral surface of thecams 7 3. The arm 77is fixedly secured to the shaft 26 V and thus as the cam 7 3 is rotatedand't-he roll- .er 76 alternately engages the high and low portions ofthe cam, the shaft26 is rocked first in one direction and then in theother and at each rocking In vement in the counterclockwise direction asviewed in Fig. 7, the

pawl 68 above described turns the ratchet wheel 67 a predetermineddistance.- Preferably l mount a retaining device, for example a starwheel 78 (Fig. 9) on the shaft to preventrev erse movement of the latterduring the retraction of the pawl 45. A roller 79engages the edge of thestar wheel 78, such roller being carried by a bell crank lever 80turning freely on the shaft 26v and having a spring 81 adapted'fto holdthe roller 79 against the star wheel. f The operation of the abovemechanism is substantially as follows, it being assumed that 7 duringnormal weaving the rods 32 and 33 occupy the positions shown in Figs. 4and 5 in their lower-' .vith the pawl lifters 34 and 00 most orinoperative positions, with the controlling cam in the dotted lineposition indicated in Fig; 8 and with the pin 66 to the right of thelatch r leasing arm 65, as viewed in Fig. 8.

' At the end of the series of repeats intended to form cut of fabric,the operator grasps the handle 57v and pulls down on the rod 56, thusswinging the controlling cam. 53 down to the full'li ie positionindicated in Fig. 8, permitting the pin 51 to drop from the high part 52of the controlling cain to the low part 59 thereof. Since the pin66doe'snot now engage'the arm 65, the latch 61 is free to engage thetooth 60, thus retaining the controlling cam 53 in the positionshown'inFig. 8. As soon as the pin'51 dropscnto the low r. part59 ofthe'controllingcam', the pawl45,

which is constantly moving, engages a tooth of the ratchet wheel 44 andthus begins to move the shaft 27 intermittently. Assuming that theroller 76' is at this time at the end of the low part 75 of the cam 78,the movement of the shaft 27 bythe pawl 45 and ratchet wheel 44 willcause the roller 76 to ride up onto the high part 74 of the cam 73, thusrocking the shaft 26 and the arms 28 and 29 and lifting the rods 32 and33. The pawls 19 and 19 are thus lifted out of engagement with thejacquard drums and the pawls 36 and 37 are permitted to engage thedrums. The drums immediately begin to turn in reverse direction, thusweaving a se tion of fabric A, Fig. 1, in which the pattern is reversed.

Since the ratchet wheel 44 has but eight teeth and since the highportion 74 of the cam 73 is substantially a semi-circumference inlength, the roller 76 will run off of the high part 74 at the endof thefourth active movement of the pawl 45. Since thispawl makes a forwardmovement corresponding to each actuation of the jacquard .the highportion 74 of the'cam and the reverse driving pawls are again put intooperat1on. Thls alternate reverse and forward drive of the patternmechanism con-' tinues for a predetermined period depend- 'ent upon thenumber of teeth in the ratchet wheel 67. At some suitable point in thisabnormal operation" of the pattern mechaism, provisionmay .be madeforweaving in a weft of distinctive color to form a cut marker G,although this is not necessary.

7 At each rocking movement ofthe shaft 26 in one direction, the pawl68is. actuated to move the ratchet wheel 67 forward one step, thusgradually-moving the pin 66 until it engages the releasing arm 65. Atthe next movement ofthe pawl 68 the 'pin 66 moves toward the position66' and actuates'the releasing .arm 67 to disengage the latch 61 (Fig.6)from the tooth 60, thereupon the spring 58 raises the rod 56 andrestores the cam to'its normal position with its high portion 52 beneaththe pin 51, thus holding the pawl 45 in inoperative position. The shafts27 and 26 thus come to rest with the roll 76 at the end of the low partof the cam '73 and with the pawl lifters 34 and 3 in inoperativeposition.

Since the jacquard drums are moved rear- Wardly and then forwardly tothe same amount at each reversal of the driving pawls they are left atthe end of the above operation in exactly the same position as at thebeginning, so that the next card presented for operation by thefollowing movement of the forward driving pawls 19 and 19 is that whichcorresponds to the beginning of a new pattern repeat, and the loommechanism is now ready to proceed in orderly fashion with the productionof a new cut of material.

l/Vhile the mechanism hereinabove described is arranged to weave thewaste section of fabric upon four cards only of the jacquard, it isobviously possible by a very slight modification to change the number ofcards which take part in the production of the waste fabric, and Icontemplate that a, greater or lesser number'may be employed ascircumstances may warrant, it being suflicient merely to change thenumber of teeth in the ratchet wheel 44 or the extent of the camsurfaces of cam '73 to produce such variation in operation.

Since withithe arrangement described but a small number of pattern cardstake part inthe operation,.no substantial difficulty is experienced inguiding and supporting these jcards as they are advanced and'thenreversed, and even though a substantially greater number of cards, forexample eight or twelve, were to take part in this operation," no suchdifficulty would be experienced as where several hundred cards areemployed.

While a desirable arrangement of mechanism has herein been illustratedand described, I contemplate that various changes in size and proportionof parts, as well as the substitution of equivalents may be madewitliout departing from the spirit of the invention.

I claim:

'1. That method of weaving textile fabric having a series of recurrentattern repeats which comprises as steps weaving a predetermined numberof complete repeats. then weaving in succession thereto a series ofshort sections each of the samenumber of picks withthe same patternreversed and in tile normal direction, alternately, the first suchsection having: the pattern reversed and the last such section havingthe pattern in norjinal directi0n,"and then weaving anew series (ifrecurrent pattern repeats.

2. That method of -weaving textile fabric having a series of recurrentpattern repeats which comprises as steps weaving a predetermined number"of complete repeats, then weavinginfa sniallnumber of picks with thepattern reve rl d,;the same numberof picks the forward direction, thesame number redetermined length of waste material has been woven, andthen proceeding to weave another series of pattern repeats in orderlyfashion.

3. That method of weaving textile fabric having a series of recurrentpattern repeats which comprises as steps weaving a predetermined numberof complete repeats, then weaving groups of four piclrs each with thepattern reversed and in normal direction e1- ternately until apredetermined length of waste material has been woven.

i. That method of weaving by the use of pattern elements in series whichcomprises as steps weaving in succession a series of lengths of fabriceach embodying a complete pattern repeat, and thercaftc' alternatelymoving a selected nu 'ibcr, substantially less than the full number, ofthe pattern elements en'iployed in formin said pattern first forwardlyand then rearwardly a plurality of times whereby to form successiveshort sections of waste fabric in which the same pattern extends innormal forward direction and in rev ase direction respectively.

5. That method of weaving by the use of warp shedding pattern elementsin series which comprises as steps weaving in succession a series oflengths of fabric each embodying a complete pattern repeat, andthereafter alternately moving a relatively small number of the elementsemployed in forming said pattern forwardly'and then rearwardly aplurality of times while weaving a predetermined length of waste fabric,and in immediate succession thereto moving the entire series of patternelements fo'rwart 1y while weaving a full pattern repeat.

6. Apparatus of the class described comprising means for weaving in succion a seriesof lengths of fabric, each length. unhodying thecomplete'normal pattern which the apparatus is designed to produce, andmeans for causing the weaving means, at the end of a selected length, toweave a short'section of waste material consisting of a series of groupsof picks, ach of the number; with the pattern reversed in alternategroups.

7. Apparatus of the class described comprising means for w ng insuccession a series of lengths of fabric, each embodying the completenormal pattern which the apparatus is designed to produce, andlllQUlSfOi causing the weaving means, at the end of a selected length,to weave four picks forming a portion of the pattern reversed, then fourpicks with the pattern in normal direction, then four picks reversed,and so on in alternation until a predetermined length of abnormal wastefabric has been woven.

8. Apparatus of the class described comprising means for weaving insuccession a series of lengths of material, each leu th cinbodying thecomplete normal pattern which the apparatus is designed to produce, andmeans for causing the weaving means, at the end of a selected length, toweave a series of successiveshort lengths of wast fabric in which aportion of the same pattern extends alternatelyin normal direction andin reverse direction, respectively, and thereafter to resume normalweaving of recurrent complete pattern repeats.

9. Apparatus of the class described comprising means for weaving insuccession a series of lengths of material, each length embodying thecomplete normal pattern which the apparatus is designed to produce, andfor causing the weaving means, at the end of a selected length,recurrently to weave a predetermined number of waste picks with the samepattern in normal forward direction and alternately the same number ofpicks in the reverse direction, and at the end of a predetermined numberof such alternations to cease interfering with the normal operation ofthe pattern means. i

10. Apparatus of the class described for use with a loom having weavinginstrumentalities and means for actuating them, pattern means forcontrolling them, and means normally operative to drive the patternmeans in a forward direction whereby to weave a series of full patternrepeats, said apparatus comprising means for temporarily taking con trolof the pattern means and for moving it alternately forward and backwarda series of times while weaving a section of fabric less in length thanafull pattern repeat. 11. Apparatus of the class described for use with aloom having weaving instrumentalities and means for actuating them,pattern means for controlling them, and means normally operative todrive the pattern means in a forward direction whereby to weave a seriesof full pattern repeats, said apparatus comprising means for driving thepattern means in reverse direction, control means for causing theforward and reverse drive means to act alternately while weavingiaseries of short len ths of fabric, and timing means for throwing thecontrol means out of action at the endofa predetermined period ofoperation. I i y i I 12. Apparatus of the class described for use with aloom having weaving instrumentalities and means for actuating them,pattern means for controlling them, and means normally operative todrive the pattern means in a normal forward. direction whereby to weavea seriesof full pattern repeats, said apparatus comprising means fordriving the pattern means in reverse direction, control means includinga cam for selectively determining the operation of the forward andreverse drive means, a pawl for moving the cam whereby alternately tocause the forward and reverse drivemeans to act, and timing means forrendering the pawl inoperative at the end of a predetermined period ofoperation.

Apparatus of the class described for use with a loom having weavinglllSil'lIln-1ltalities and means for actuating them, pattern means forcontrolling them, a driving pawl normally operative to move the patternmeans step by step in a forward direction, said apparatus comprisingmeans for moving the pattern means step by step in a reverse direction,a cam adapted to cause the forward and reverse drive means alternatelyto operate, a ratchet wheel for driving the cam, a pawl for moving theratchet wheel step by step, and timing means for determining the lengthof the period of operation of the pawl.

i l. Apparatus of the class describedfor use with a loom having weavinginstrumentalities and means for actuating them, pattern means forcontrolling them, and means normally operative to drive thepattern meansin a forward direction whereby to weave a series of full patternrepeats, said apparatus comprising means for driving the pattern inreverse direction, manually actuable control means for causingtheforward and reverse drive means to act alternately while weaving a likenumber of picks, and timing means for throwing the control means outof'operation at the end of a predetermined series of reversals.

15. Apparatus of the class described for use with a loom having weavinginstrumentalities and means for actuating them, pattern means forcontrolling them, and means normally operative to drive the patternmeans in a forward direction whereby to weave normal pattern repeats,said apparatus comprising means for driving thepattern; means in reversedirection, control means for causing the forward and reverse drive meansto act alternately while weaving a like number of picks, a latch tomaintain the control means in operation, and timing means operativeafter a predetermined series of reversals, to release the latch andthereby permit the control means to cease its function.

16. An attachment for controlling a jacquard mechanism having meansnormally operative to move a series of pattern cards forward step bystep, said-attachment compris ing reverse drive means, a normallystationary cam having high and low parts adapted to determinealternatingperiods of operation of the forward and reverse drive meansrespectively, a ratchet wheel for turning the .cam, the number of teethof the wheel being an even multiple of the sum of the high and low partsof the cam, a normally inactive pawl for actuating the ratchet wheel andmeans for initiating effective movement of the pawl to turn the ratchetwheel.

17. An attachment for controlling a jacquard mechanism-having meansnormally. operative to move a series of pattern cards forward step bystep, said attachment comprising reverse drive means, a normallystationary' rotary cam having high and low lie parts each ofsubstantially equal extent adapted to determine alternate periods ofoperation of the forward and reverse drive means respectively, a ratchetwheel for driving thecam, the ratchet wieel having an even number ofteeth, means for actuating the ratchet, and means operative after apredetermined number of revolutions of the cam to disengage the pawlfrom the ratchet wheel.

18. Apparatus of the class described for use with a loom having weavinginstrumentalities and means for actuating them, pattern means forcontrolling them, a driving pawl norn'ially operative to move thepattern means step by step in a forward direc tion, said apparatuscomprising means for moving the pattern means step by step in a reversedirection, a normally stationary cam adapted, when moved, to cause theforward and reverse drive means alternately to 0p erate, a ratchet wheelfor driving the cam, a pawl for moving the ratchet wheel step by step, apawl controller operative to hold the pawl out of action during normalweav ing, means for moving the pawl controller to inactive position topermit the pawl to operate the ratchet wheel and for temporarily holdingthe controller in inactive position, and timing means operative topermit the pawl controller to return to normal operative position at theend of a predetermined period.

19. Apparatus of the class described for use with a loom having weavinginstrumentalities and means for actuating them, pattern means forcont-rolling them, a driving pawl normally operative to move the patternmeans step by step in a forward direction, said apparatus comprisingmeans for moving the pattern means step by step in a reverse direction,a normally stationary cam adapted, when moved, to cause the forward andreverse drive means alternately to operate, a ratchet wheel for drivingthe cam, a pawl for moving the ratchet wheel step by step, a pawlcontroller normally operative to hold the pawl out of action duringnormal weaving, means for moving the pawl controller to inactiveposition to permit the pawl to operate the ratchet wheel, a latch fortemporarily holding the controller in inactive position, and timingmeans for releasing the latch.

20. An attachment for controlling a jacquard mechanism having meansnormally operative to move a serles of pattern cards for ard step bystep, said attachment comprising reverse drive means, a normallystationary cam adapted, when moved, to cause the forward and reversedrive means alternately to actuate the cards, and means for turning thecam and for stopping it after a plurality of revolutions.

' 21. An attachment for controlling a jacquard mechanism having meansnormally operative to move a series of pattern cards forward step bystep, said attachment comprising reverse drive means, a normallystationary cam adapted when moved to cause alternate operation of theforward and reverse drive means, means for advancing the cam step bystep, and retaining means for holding the cam stationary during theintervals between successive advances thereof.

22. An attachment for controlling a jacquard mechanism having meansnormally operative to move a series of pattern cards forward step bystep, said attachment comprising reverse drive means, a normally stationary cam adapted to be rotated and thereby to cause alternateoperation of the for ward and reverse drive means, pawl and ratchetmeans for turning the cam step by step, and detent means for preventingreverse movement of the cam when the pawl is retracted.

23. Apparatus for use with a loom having weaving instrumentalities andmeans for actuating them, pattern means for controlling them, a drivingpawl normally operative to move the pattern means step by step in aforward direction, said apparatus comprising means for moving thepattern means step by step in a reverse direction, a cam adapted tocause the forward and reverse means alternately to operate, a ratchetwheel for driving the cam, a pawl for moving the ratchet wheel step bystep, a latch for temporarily holding the controller in inactiveposition, a ratchet wheel, a pawl operative at each shift from reverseto forward drive to advance the ratchet wheel, and a latch releasing pincarried by the ratchet wheel and adapted to release the latch at the endof a predetermined arc of movement of the wheel.

Signed by me at Boston, Massachusetts, this sixteenth day of November,1928.

GEORGE H. PERKINS.

